西藏定日县陈塘村坡面泥石流形成机制研究  

Formation mechanism of debris flow on the slope of Chentang Village,Dingri County,Xizang

作　　者：朱涛 温金梅 敬正凯 陈星 杨龙 ZHU Tao;WEN Jinmei;JING Zhengkai;CHEN Xing;YANG Long(208 Hydrogeological and Engineering Geological Team of Chongqing Bureau of Geology and Mineral Exploration and Development(Chongqing Geological Disaster Prevention Engineering Exploration and Design Institute),Chongqing 400700,China)

机构地区：[1]重庆市地质矿产勘查开发局208水文地质工程地质队(重庆市地质灾害防治工程勘查设计院),重庆400700

出　　处：《城市地质》2025年第1期92-97,共6页Urban Geology

基　　金：西藏自治区地质勘查基金项目(XZDZ202108015)资助。

摘　　要：定日县陈塘村位于喜马拉雅山脉南坡,地层岩性以前震旦系变质岩为主,地貌为深切峡谷,地质环境条件复杂多变,地质灾害频发。文章通过对陈塘村坡面泥石流的野外地质灾害详细调查和室内综合研究,分析了坡面型泥石流的形成条件和演化过程。结果表明:该泥石流演化模式为顶部刮铲演化模式,发展和演变过程遵循蠕滑→滑流→刮铲滑流→堆积的顺序,主要影响因素是短时性集中强降雨。在此基础上,针对陈塘村坡面泥石流提出了以“拦”为主和以“排”为主的两个方案,经综合对比分析选取了“谷坊坝+桩板墙停淤堤+清淤+截水沟”的拦挡防治措施,为以后地质灾害风险评价提供了参考方向。Chentang Village in Dingri County is located on the southern slope of the Himalayas.The formation lithology is dominated by the former Sinian metamorphic rocks.The landform is a deep canyon with complex and changeable geological environment conditions,where geological disasters occur frequently.In order to summarize the mechanism of geological disasters in Chentang Village and the surrounding areas,this paper analyzes the formation conditions and evolution process of slope debris flows through detailed investigation of field geological disasters and comprehensive indoor research.The results show that the evolution model of the debris flow is the top scraping evolution model,and the development and evolution process follow the order of creeping slip→slip flow→scraping slip flow→accumulation.The main impact is short-term concentrated heavy rainfall.On this basis,two schemes,"interception"and"discharge",are proposed for the debris flow on the slope of Chentang Village.After comprehensive comparative analysis,the"Check Dam+Pile Plate Wall Stop Silt Embankment+Clearing Silt+Interception Ditch"interception and prevention measures are selected,providing a reference direction for future geological hazard risk assessment.

关 键 词：定日县 泥石流 坡面型 形成条件 演化过程 

分 类 号：P64[天文地球—地质矿产勘探]